Image of conditioner: protects hair from damage for up to 3 days*, weightlessly detangles hair, maintains hair health for all hair types, fortifies, softens + smooths, enhancers hairs natural shine, vegan, cruelty-free + plastic net zero

Image of conditioner: protects hair from 3 types of damage for up to 3 days*, environmental aggressors, UV rays, mechanical styling

DAMAGE SHIELD protective conditioner 8.5oz

Image of hair strand graphic: why hair needs a shield, damage happens every day from: uv rays, mechanical styling, environmental aggressors, damage happens at every level

Image of hair strand graphic: damage protection from the inside out, outside: ceramic blend + biotech-produced polysaccharide. Inside: K18PEPTIDETM

Image of K18 routine: K18 healthy hair routines, when you need to repair damage (detox shampoo + leave-in mask, when you need to protect against daily damage (pH shampoo + conditioner)

Image of models: shield you healthiest hair against daily damage

Image of model: weightlessly soften, smooth + detangle hair without film-forming silicones or waxes that can build up over time

4.6

Rated 4.6 out of 5 stars

276 Reviews

DAMAGE SHIELD protective conditioner

Name: DAMAGE SHIELD protective conditioner 8.5oz
Brand: K18Hair
SKU: K18-40055
Price: 36.00 USD
Availability: InStock
Rating: 4.6 (276 reviews)

Nourishing conditioner shields hair from daily damage

Description

A nourishing, protective conditioner that helps shield hair from daily damage to help maintain hair health and improve smoothness and shine. Engineered to weightlessly soften and detangle while the K18PEPTIDE™ helps replenish hair during washing.

protects from damage for up to 3 days from:

UV rays
mechanical styling
environmental aggressors

more to know

Clinically proven to provide conditioning protection against damage from UV rays, mechanical styling, and environmental aggressors for up to 3 days*. Fortifies, softens, and detangles hair.

Defends against damage: Conditioning protection against damage from UV rays, environmental aggressors, and daily mechanical styling for up to 3 days
Maintains hair health: Fortifies hair’s exterior lipid barriers to make hair more resilient and resistant to damage. K18PEPTIDE™ replenishes protein lost during washing.
Enhances hair’s natural shine: pH-optimized formula minimizes excess cuticle swelling during washing to help keep hair smooth and maximize shine.
Softens, smooths, and detangles: Without film-forming silicones or waxes that can build up over time and weigh hair down.

*Disclaimers

key benefits

Biotech-Produced Polysaccharide acts as a biomimetic shield to protect hair against pollution and environmental aggressors
Fortifying Ceramide Blend seals damage sites in the hair cuticle—smoothing and protecting hair from further damage
K18PEPTIDE™ replenishes protein lost during washing

how to use

Apply a small amount of DAMAGE SHIELD protective conditioner from mid-lengths to ends and build as needed.
Rinse thoroughly.
For best results, use after shampooing with DAMAGE SHIELD shampoo.

ingredients

Water (Aqua) (Eau), Isopropyl Palmitate, Stearyl Alcohol, Propanediol, Isopentyldiol, Behentrimonium Chloride, Tocopherol, Tocopheryl Acetate, sh-Oligopeptide-78, Alteromonas Ferment Extract, Prunus Amygdalus Dulcis (Sweet Almond) Oil, Simmondsia Chinensis (Jojoba) Seed Oil, Phospholipids, Jojoba Esters, Calcium Gluconate, Hydroxypropyl Guar Hydroxypropyltrimonium Chloride, Ceramide NP, Phytosteryl/Isostearyl/Cetyl/Stearyl/Behenyl Dimer Dilinoleate, Polyquaternium-16, Stearalkonium Chloride, Isopropyl Alcohol, Butylene Glycol, Gluconolactone, Phenoxyethanol, Sodium Benzoate, Citric Acid, Sodium Hydroxide, Fragrance (Parfum), Hydroxycitronellal.

pairs well with

DAMAGE SHIELD pH protective shampoo

4.7

Rated 4.7 out of 5 stars

366 Reviews

Color-safe protective shampoo maintains hair health + strength

K18 molecular repair hair oil

4.7

Rated 4.7 out of 5 stars

668 Reviews

Weightless oil that strengthens, repairs damage + reduces frizz

Description

have questions?

Get started here

Can I use the conditioner instead of the mask?

The mask and conditioner serve two different purposes. The K18 mask reverses damage in 4 minutes, while the K18 conditioner protects hair from daily damage for up to 3 days*. We recommend using the K18 mask first, waiting 4 minutes, then using conditioner for additional softening and detangling benefits between K18 mask days. *Disclaimers

Will the K18 conditioner cause buildup on hair?

No, the K18 conditioner will not cause buildup on hair. The highly concentrated, lightweight gel formula means a little goes a long way. Use less than you typically would with a traditional conditioner, and build as needed.

Will the K18 conditioner weigh hair down?

No, the K18 conditioner will not weigh hair down. This highly concentrated, lightweight gel formula softens, smooths, and detangles without film-forming silicones or waxes that can build up over time.

Does the K18 conditioner need to be reapplied for continued UV protection?

No, you do not need to reapply the K18 conditioner for continued UV protection. This product is clinically proven to protect hair against damage from UV rays for up to 3 days*. *Disclaimers

Does the K18 conditioner have SPF?

No, the K18 conditioner does not have SPF. The biotech-produced polysaccharide and fortifying ceramide blend help minimize the drying and damaging effects of UV rays on the hair's cuticle. This prevents hair from becoming rough, brittle, weak, and prone to breakage from UV damage for up to 3 days*. *Disclaimers

3-day damage protection, powered by biotech

why hair needs a shield

Damage happens every day from UV rays, mechanical styling, and environmental aggressors—weakening, dulling, and causing frizz on all hair types.

how the shield works

Protect hair BEFORE daily damage occurs. Our biology-first approach to haircare draws inspiration from nature’s resilience to harsh environments. Engineered into 3-day conditioning protection without the need to reapply.

expert-approved protection

Trichologist Angela Onuoha breaks down how common hair aggressors damage hair, and how DAMAGE SHIELD protects hair between K18 mask days.

all hair types need daily damage protection

Discover why PROs are recommending weightless conditioning protection to every client.

certified microbiome-friendly conditioning

Biology-first formula keeps your scalp microbiome in balance with 3-day conditioning damage protection.

feel what's possible with K18

See how K18 unlocks our community's expression

4.6

Rated 4.6 out of 5 stars

Based on 276 reviews

Write a Review (Opens in a new window)

276 reviews

Sort

Rebecca D.
Verified Buyer
Reviewing
DAMAGE SHIELD shampoo and conditioner sample
I recommend this product
Rated 5 out of 5 stars
16 minutes ago
Tried the sample and immediately hit BUY!
I’m rehabbing some over processed hair and also dealing with some fallout from surgeries in the fall. I ordered the treatment first and with it came these samples. One try and I had to buy!
Was this helpful?
Stacy D.
Verified Buyer
Reviewing
DAMAGE SHIELD protective conditioner 8.5oz
I recommend this product
Age 45 - 54
Hair Concern Chemical damage, Heat damage, Fragile/brittle hair, Split-Ends, Oily hair/scalp
Hair Type Fine/Thin
My Results Soft Touchable Hair, Less Frizz, Cleaner, fresher hair, Smoother Hair, Visible Difference
Rated 5 out of 5 stars
6 days ago
Game changer
I was seriously skeptical, I’ve tried so many brands. My hair is long and very processed, I’ve been platinum for years.
The shampoo/conditioner set makes my hair so soft, but the unbelievable part is how much dry time is cut!
Was this helpful?
K
K18Hair
4 days ago
A cutback in dry time is a win! Thank you Stacy!
Melissa B.
Verified Buyer
Reviewing
mini DAMAGE SHIELD protective conditioner 1.8oz
I recommend this product
Age 35 - 44
Hair Concern Chemical damage, Frizz, Fragile/brittle hair, Split-Ends, Dryness
Hair Type Medium Density
My Results Less Frizz, Visible Difference, Smoother Hair
Rated 5 out of 5 stars
1 week ago
Amazing!
Saw results in just over 2 weeks with this and other products I ordered! My daughter steals my products now too!!! Works great with her extensions!
Was this helpful?
K
K18Hair
1 week ago
Thank you Melissa! K18 works amazing with human hair extensions!
johanna f.
Verified Buyer
Reviewing
DAMAGE SHIELD protective conditioner 8.5oz
I recommend this product
Age 45 - 54
Hair Concern Color-care, Heat damage, Chemical damage
My Results Bouncy Hair, Stronger Hair, Shinier Hair, Visible Difference, Defined Curl/Wave Pattern
Rated 5 out of 5 stars
1 week ago
Love it!
The changes I saw in my first wash is amazing. I will recommend it to all my friends
Was this helpful?
K
K18Hair
1 week ago
Beautiful hair! Thank you for recommending us to your friends!
Eddie H.
Verified Buyer
Reviewing
DAMAGE SHIELD shampoo and conditioner sample
I recommend this product
Rated 5 out of 5 stars
2 weeks ago
WOW
This shampoo and conditioner really made a difference in my hair. It looks smoother and healthier and brought back to life! I did one side with the k18, and the other with another luxury brand I use, and the results speak for themselves.
Was this helpful?
K
K18Hair
2 weeks ago
Wow what a noticeable change! Thank you for this!

Reviews LoadedReviews Added